Perhaps the book has outdated or inaccurate information, or the characters and their development aren't compelling enough. These could all be factors that make you not want to concern yourself with it.
It could be that the book is simply not relevant to you. There are countless novels out there, and not all of them will be of interest or benefit to every person. If it's a genre you don't like, such as horror and you're easily scared, or a very complex philosophical novel when you're just looking for light reading, then it's best not to concern yourself with it.
You can focus your attention on other books that you are interested in. Read reviews of other novels and get involved in book clubs that discuss different books. By filling your time with other literary works, you'll naturally have less time and inclination to concern yourself with that particular book novel. You can also set goals for the books you want to read, and keep that goal - focused list in mind so that you don't deviate towards the book you're supposed to avoid.
Maybe it's poorly written or has a confusing plot.
Maybe you lack the passion or creativity for it. Without those, it could be a struggle to come up with interesting plots and characters.
Maybe because it can be super challenging to come up with unique and engaging plots. Not everyone has that creativity flowing easily.
Because the story can have a greater impact when shared and discussed outside the book.
Sometimes, true stories can be limiting in terms of creativity and imagination. They might not have the exciting twists and turns that fictional tales can offer.
Maybe because they have a hard time concentrating on fictional stories or get easily distracted. For them, the make-believe elements don't hold their attention.
Well, judging a book by its cover can lead to wrong assumptions. The cover might be designed to attract attention but not represent the depth and value of the writing. Sometimes, hidden gems have simple covers.
Because a book can have many other elements that contribute to its value besides the story, like the writing style, character development, and themes.